How to do Casting ?

try

val e = MyConstr()

- Carsten

On Thu, Apr 2, 2009 at 4:40 PM, Steven Obua <obua@me.com> wrote:

Hi,

in the code below I try to cast a value "MyConstr" to type "MyClass".
Running the code throws a ClassCastException. What am I doing wrong?

Thanks,

Steven

<code>
package ra

object Main {

 class MyClass
 case class MyConstr extends MyClass

 def main(args: Array[String]) = {
   val e = MyConstr
   val f = e.asInstanceOf[MyClass]
   println("hello")
 }

}
</code>
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Ok, found my mistake.

I think I confused "MyConstr" with "MyConstr ()".

Steven

On Thu, 2009-04-02 at 08:04 -0700, Steven Obua wrote:
> Ok, found my mistake.
>
> I think I confused "MyConstr" with "MyConstr ()".

Note that case classes without a parameter lists have been deprecated.
As the compiler suggests, use case objects or case classes with () as
the parameter list.

Ismael

MyConstr refers to a singleton; the generated companion object MyClass.
Generally, if in doubt, add type annotations.
val e: MyConstr = MyConstr //will fail to compile, telling you the problem.

2009/4/2 Carsten Saager <csaager@gmail.com>

try

val e = MyConstr()

- Carsten

On Thu, Apr 2, 2009 at 4:40 PM, Steven Obua <obua@me.com> wrote:

Hi,

in the code below I try to cast a value "MyConstr" to type "MyClass".
Running the code throws a ClassCastException. What am I doing wrong?

Thanks,

Steven

<code>
package ra

object Main {

 class MyClass
 case class MyConstr extends MyClass

 def main(args: Array[String]) = {
   val e = MyConstr
   val f = e.asInstanceOf[MyClass]
   println("hello")
 }

}
</code>
--
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Sent from the Scala mailing list archive at Nabble.com.